Breech block with rim fire striker

ABSTRACT

A standard rifle mechanism of the Mauser type having means which converts it to rim fire operation, the breech block having locking means for guiding and locking it to a body which includes a barrel. The breech block has a plug-in head in its forward end and said head has an eccentrically-located firing pin and said head is provided with a hole for a spring-actuated ejector pin. A clip has ends abutting against parts of a yoke that is formed with an extractor tooth, the yoke and its tooth being countersunk in the plug-in head and the tooth is arranged to grip the rim of a cartridge that is introduced in a seat in the barrel, the extractor and a locking pin being effective to keep the head in its proper place, the extractor and pin being in turn kept in their positions by a counter-sunk spring clip that extends around the jacket wall of the breech block.

ilnited States Patent Ekieldt et al.

[451 Oct. 10, 1972 1 BREECH BLOCK WITH RIM FIRE STRIKER 22 Filed: July 17, 1970 211 App]. No.: 55,861

[52] U.S. Cl ..42/16, 42/25 [51] Int. Cl. ..F4lc 11/00, F410 15/00 [58] Field of Search ..42/16, 25

[56] References Cited UNITED STATES PATENTS 495,741 4/1893 Krnka ..42/16 1,5 I 7,483 12/1924 Young ..42/16 2,098,562 ll/l937 Browning ..42/16 FOREIGN PATENTS OR APPLICATIONS 465,326 4/ 1937 Great Britain ..42/25 Primary ExaminerBenjamin A. Borchelt Assistant Examiner-C. T. Jordan Att0meyMunson & Fiddler [57] ABSTRACT A standard rifle mechanism of the Mauser type having means which converts it to rim fire operation, the breech block having locking means for guiding and locking it to a body which includes a barrel. The

breech block has a plug-in head in its forward end and said head has an eccentrically-located firing pin and said head is provided with a hole for a spring-actuated ejector pin. A clip has ends abutting against parts of a yoke that is formed with an extractor tooth, the yoke and its tooth being counter-sunk in the plug-in head and the tooth is arranged to grip the rim of a cartridge that is introduced in a seat in the barrel, the extractor and a locking pin being effective to keep the head in its proper place, the extractor and pin being in turn kept in their positions by a counter-sunk spring clip that extends around the jacket wall of the breech block.

2 Claims, 2 Drawing figures PATENTEDncnovm 3.696542 Axel Emanuel Ekfeldt and Eric Wilhelm Wallberg,

Inventors:

HINSUN & l" I llDLl-IR,

At Lorxmyzs.

BREECH BLOCK WITH RIM FIRE STRIKER BACKGROUND OF THE INVENTION Rifle mechanisms for repeating type guns, such as those that appeared in the later half of the 19th century, have since then been manufactured and used in the army even through World War II and are still employed in hunting guns. These guns are usually designed for cartridges that have a centrally-located percussion cap inserted in the bottom of the cartridge case. The reason for this so-called central ignition primarily is that it is relatively easy to arrange a centrally located firing pin that is independent of the turning motion of the breech block. An example of such a mechanism is the Mauser system that appears in a great number of modifications that employ the same locking principle. The repeating type rifle with Swedish Army classification m/ l 896 and 1938 and repeating carbine m/ l 894 with modifications all employ this type of mechanism. However, the rim fire problem is the same for most of the repeating mechanisms, even if they are designed according to the principle of simple or compound (one of two stage) movement of the mechanism.

The present invention relates to a change of a mechanism of the type that has a symmetrically located firing pin to a rim fire mechanism, which offers many essential advantages such as lower ammunition costs, lower safety risks etc. The conventional and rather common rim fire cartridges of .22 caliber .22 short, .22 long and .22 long rifle) are internationally standardized and the price of which is often less than onetenth of the price of the normal army-type rifle cartridge. The rim fire cartridges have low muzzle energy and are made with a lead projectile that is ejected with relatively low velocity, with the result that the requirement for safety devices or precautions on the shooting ground could be kept at a minimum. They also have such properties as accurate precision which has resulted in a growing interest among active participants in the international shooting movement. So far, however, this ammunition has been used in specially designed guns (such as shown for example in German Pat. No. 356,891, French Pats. Nos. 646,394 and 578,615, because the mechanism must be made from the start to meet the requirements of rim fire. According to the presentprinciple, every mechanism that fulfills certain minimum requirements can be changed to rim fire operation, and still the parts of the gun, their handling and operation are substantially the same as before.

DESCRIPTION OF THE INVENTION One embodiment of the invention will now be described with reference to the accompanying drawing wherein is shown a Swedish m/l896 Mauser mechanism and wherein FIG. 1 is an exploded view showing the new and changed parts in the forward end of the breech block, and

FIG. 2 is a main section through the forward end of the breech block and the rear end of the barrel showing an inserted cartridge.

Referring to the drawing, there is shown therein a barrel 1 which has in its rear end a slightly tapering section 2 for a cartridge seat that is inserted into the front end of a compound breech block 3, having an axial bore 15 for the rear end 2 of the barrel 1. The breech block 3 also has a number of locking flanges 4 that enter corresponding locking means such as grooves in the mechanism casing or body in the usual way, whereby a symmetrical locking is maintained. In the bore 15 of the breech block is a forwardly-inserted plug-in type breech block head 5, acting as a guide for a firing pin 6, an ejector 7 with a coil spring and a case extractor 8. The plug-in head has a shoulder that abuts against a corresponding edge in the bore 15 of the breech block. The head 5 is locked to the breech block 3 by means of a locking pin 9 that in its turn is locked by a counter-sunk spring clip 14 provided with a resilient tongue for the extractor 8. In order to keep the firing pin 6 and ejector 7 in their positions in the head 5, a flat locking clip 10 is inserted in the head 5 so that the clip passes through shallow guiding grooves in these parts, and the clip 10 in its turn is held in place by the wall of the bore 15. The extractor 8, that is journalled in an axial recess 16 in the head 5, is provided in its rear end with a transverse yoke 11 that is also journalled in a groove in the head 5. This arrangement prevents the extractor 8 from moving axially in the breech block and the yoke l l of the extractor cannot get out of its groove because it is kept in place by the wall of the bore 15.

The yoke 11 also prevents the clip 10 from turning around in its groove, and the free ends of the clip 10 therefore abut against the flat end surfaces 12 of the yoke 11. The clip 10 also holds the firing pin in the head so that it cannot fall out rearwardly and this is accomplished through a cut in the front end of the firing pin. The forward motion of the firing pin is halted by a conical tapering section 13 having a reduced diameter (FIG. 2) with a corresponding conical seat in the hole for the firing pin. The firing pin is taken out rearwardly and its total length is such that a proper penetration depth in the percussion cap is obtained.

The operation of the device is substantially as follows:

When the breech block 3 pulls the cartridge case out of its seat, the extractor 8 attempts, because of the spring pressure of the ejector 7, to throw the empty cartridge to the right and upwardly. The ejector 7 is taken out forwardly'and is kept in its hole in the same way as the firing pin 6 because the one end of the clip 10 passes through a transverse cut in the ejector body. The rear part of the firing pin (not shown) has been cut off ahead of the supporting flange for the striker spring and this flange is made flat in order to serve as impact surface for the forward part of the firing pin in the breech block head 5.

What is claimed is:

1. A rifle mechanism converted to rim fire operation, comprising, a breech block provided with locking means for guiding and locking said breech block to a mechanism casing, said casing including a barrel in its forward end, the breech block having a forwardly open axial bore into which is introduced a plug-in head provided with a first axial hole receiving an eccentrically, off-axis firing pin and a second axial hole for a springactuated ejector pin, whereby both the firing pin and the ejector pin have deep, transversely-directed grooves engaging a flat U-shaped clip introduced transversely into the head, said clip having free ends which abut against the end surface of a yoke having a forwardly-projecting part provided with an extractor tooth, said yoke and its tooth being counter-sunk in the plug-in head, said tooth gripping around the rim of a cartridge that is introduced into a seat in the rear end of the barrel, whereby the extractor and a locking pin, inserted radially through the wall of the breech block keeps the head in proper place and are kept in their positions by a counter-sunk spring clip extending around the jacket wall of the breech block.

2. A rifle mechanism according to claim 1, wherein the guiding and locking means for the breech block in- 

1. A rifle mechanism converted to rim fire operation, comprising, a breech block provided with locking means for guiding and locking said breech block to a mechanism casing, said casing including a barrel in its forward end, the breech block having a forwardly open axial bore into which is introduced a plug-in head provided with a first axial hole receiving an eccentrically, off-axis firing pin and a second axial hole for a spring-actuated ejector pin, whereby both the firing pin and the ejector pin have deep, transversely-directed grooves engaging a flat U-shaped clip introduced transversely into the head, said clip having free ends which abut against the end surface of a yoke having a forwardly-projecting part provided with an extractor tooth, said yoke and its tooth being counter-sunk in the plug-in head, said tooth gripping around the rim of a cartridge that is introduced into a seat in the rear end of the barrel, whereby the extractor and a locking pin, inserted radially through the wall of the breech block keeps the head in proper place and are kept in their positions by a counter-sunk spring clip extending around the jacket wall of the breech block.
 2. A rifle mechanism according to claim 1, wherein the guiding and locking means for the breech block includes flanges on the breech block engaging grooves in the body, the plug-in part having a reduced diameter part which fits into the bore in the breech block, the clip which extends transversely in the head being a flat notched disk having the free ends that engage the yoke, the yoke being substantially T-shaped to provide it with a cross-piece and a central tooth, the counter-sunk spring clip consisting of a breech block encircling band having a projecting spring finger engaging and holding down the yoke. 